Miss.i • 👼our baby was to beautiful for earth👼

I'm confused , why did I in the beginning of what's to be my fertile week get a positive on my clear blue digital ovulation kit I got a smiley face the first day of my fertile window, then yesterday was ovulation so I took another test and it was a blank face . did I miss my ovulation was my calculation wrong how many days should you ovulate after first day of fertile?

Does this make any since?